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Which term of the AP: 121, 117, 113,……… ...

Which term of the AP: 121, 117, 113,……… is the first negative term?
[Hint:Find n for `a_(n) lt 0`]

Answer

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Knowledge Check

  • If the nth term of an A.P. is t_(n) =3 -5n , then the sum of the first n terms is ………

    A
    `n/2 [1-5n]`
    B
    `n(1-5n)`
    C
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    D
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  • If the 7^(th) term of n A.P is 40. Then the sum of its first 13 terms is

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    B
    53
    C
    2080
    D
    1040

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